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Up: 9. Product Description
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Subsections
There are two files in this section: SWER SWS Edited Raw Data and
SSTA SWS Compact Status.
9.2.1 SWS Edited Raw Data
These files are normally named SWER*.FITS, where `*' is a number generated from
the revolution the observation was made, the order the observations were
performed in that day and the order it appeared in the proposal.
The ERD files contain primary headers described in Table
9.2.1. In this table example information is used to fill the
header.
Most keywords are self explanatory. Those that are not include:
- TMRATE
- The Telemetry Rate can only be 32, indicating 32 kbps.
- EOHAAOTN
- This can take the values S01, S02, S06 or S07, for the
appropriate AOT. This is copied from the field of the same name in the
EOHA file for the
observation, see the ISO Satellite & Data Manual for an
explanation of this file.
- EOHAPCAT
- indicates the proposal category as entered by the user in
PGA. The categories were European GT, NASA GT, ISAS GT, OT or Calibration, and
these are coded in EOHAPCAT as the ASCII numbers 1 to 5 respectively. This is
copied from the field of the same name in the EOHA file for the observation.
- EOHATTYP
- indicates the scientific category as entered by the
user in PGA. The categories were Solar System, Interstellar Matter, Stellar
Physics, Extragalactic Systems or Cosmology, and these are coded in EOHATTYP as
the ASCII numbers 001 to 005 respectively. This is copied from the EOHASCAT
field in the EOHA file for the observation.
- ATTUTCS
- should be close in value to EOHAUTCS. If the observation
contains micro-slews (e.g. SWS aperture changes) this value will refer to the
first pointing.
- ATTOTFTH
- AOT on target flag. When the pointing is within this accuracy
of the target the on target flag is set.
- ATTTYPE
- Can be set to ``T'' for solar system tracking, ``P'' for fine
pointing (single target) or ``R'' for a raster operation.
- Time keys
- The various time keys, referred to by TREFUTK, TREKITK and
TREFITKU, are described in the ISO Satellite & Data Manual.
- VERSn
- indicates the version numbers of the various files used to
generate this product.
Table 9.1:
ERD primary headers
| Header keyword |
Contents |
Comment |
| SIMPLE = |
T |
|
| BITPIX = |
8 |
|
| NAXIS = |
0 |
|
| EXTEND = |
T |
|
| ORIGIN = |
'ESA ' |
European Space Agency |
| TELESCOP= |
'ISO ' |
Infrared Space Observatory |
| INSTRUME= |
'SWS ' |
Instrument used |
| COMMENT |
|
SWS Edited Raw Data |
| FILENAME= |
'SWER23300209' |
File name in ISO archive |
| DATE = |
'26/09/95' |
Creation date 95/269 |
| FILEVERS= |
'0377 ' |
Version ID in ISO archive |
| OLPVERS = |
'LATEST ' |
SOC OLP system version |
| CALGVERS= |
'CALG_40 ' |
/ SOC OLP CAL-G files version |
| USERNAME= |
'PIPELINE' |
/ |
| VERS1 = |
'1411/EOHA282' |
/ Version ID of each input file |
| VERS2 = |
'1411/EOHI282' |
/ Version ID of each input file |
| VERS3 = |
'0804/APPH282' |
/ Version ID of each input file |
| OBJECT = |
'NGC6543 ' |
Target ID as given by proposer |
| OBSERVER= |
'SWS ' |
Proposer ID in ISO Mission DB |
| EQUINOX = |
2000.0 |
Equinox |
| TMRATE = |
32 |
Telemetry rate in Kbps (Kbits/sec) |
| EOHAUTCS= |
'96130004435' |
Approx. UTC of start of observation |
| EOHAUTCE= |
'96130013951' |
Approx. UTC of end of observation |
| EOHAAOTN= |
'S06 ' |
AOT name |
| EOHAPLID= |
'SWS_EE2 ' |
Proposal ID |
| EOHAOSN = |
'09 ' |
Observation sequence number |
| EOHAPSN = |
'00 ' |
Pointing sequence number |
| EOHAPCAT= |
'4 ' |
Proposal category |
| EOHACIND= |
' ' |
Calibration indicator |
| EOHATTYP= |
'003 ' |
Target type |
| AOTVERS = |
'95118180436' |
AOT-to-OCT logic version |
| TREFCOR1= |
241288656 |
/UTC of 1st reference time |
| TREFPHA1= |
282.19191 |
/Orbital phase at TREFCOR1 |
| TREFCOR2 = |
241289612 |
/UTC of 2nd reference time |
| TREFPHA2 = |
282.20301 |
/Orbital phase at TREFCOR2 |
| TREFCOR3 = |
241290568 |
/UTC of 3rd reference time |
| TREFPHA3 = |
282.21411 |
/Orbital phase at TREFCOR3 |
| ATTUTCSL= |
'96130004411' |
UTC of start time of slew to intended target |
| ATTUTCS = |
'96130004421' |
UTC of time of first arrival at intended target |
| ATTOTFTH= |
10.0 |
On-target flag threshold (arc secs) |
| ATTRA = |
303.56 |
Intended Right Ascension of
instrument viewing, in degrees |
| ATTDEC = |
28.0 |
Intended DEClination (with ATTRA), in degrees |
| ATTTYPE = |
'R ' |
Type of attitude operation (P/R/T) |
| ATTGUIDE= |
150002 |
Guide star reference number |
| ATTSAANG= |
92.6 |
Solar aspect angle (degrees) |
| ATTERROR= |
0 |
CONTINGEncy flag(0=success; 1=target not acq'd) |
| TREFUTC1= |
231986675 |
UTC (whole seconds since 01-01-1989) |
| TREFUTC2= |
4101430 |
UTC (remaining fraction of second) |
| TREFUTK = |
1781286624 |
ISO Uniform Time Key (UTK) |
| TREFITK = |
1781286624 |
ISO INSTRUMENT Time Key (ITK) |
| TREFITKU= |
0.04166666666667 |
ITK unit length in seconds |
The ERD file contains records with the fields described in Table 9.2.
Table 9.2:
Records in the ERD file
| Field name |
Number |
Format |
Comment |
| GPSCTKEY |
1 |
I*4 |
Instrument time key |
| GPSCRPID |
2 |
I*1 |
Raster point ID |
| GPSCFILL |
1 |
I*2 |
Filler |
| SWERDR5 |
12 |
I*2 |
5-micron array readouts |
| SWERDR10 |
12 |
I*2 |
10-micron array readouts |
| SWERDR20 |
12 |
I*2 |
20-micron array readouts |
| SWERDR35 |
12 |
I*2 |
35-micron array readouts |
| SWERDRFP |
4 |
I*2 |
FP detector readouts |
| SWERHK1 |
1 |
I*2 |
SW scanner - actual position (if mode
= 0,1) |
| SWERHK2 |
1 |
I*2 |
SW scanner - LVDT output
(if mode = 0,1) |
| SWERHK3 |
1 |
I*2 |
SW scanner motor current (if mode=1) |
| SWERHK4 |
1 |
I*2 |
SW scanner DAC output (if mode=1) |
| SWERHK5 |
1 |
I*2 |
LW scanner - actual position (if mode
= 0,2,3) |
| SWERHK6 |
1 |
I*2 |
LW scanner - LVDT output
(if mode = 0,2,3) |
| SWERHK7 |
1 |
I*2 |
LW scanner motor current (if mode=2) |
| SWERHK8 |
1 |
I*2 |
LW scanner DAC output (if mode=2) |
| SWERHK9 |
1 |
I*2 |
Last received internal command
(if mode=3) |
| SWERHK10 |
1 |
I*2 |
Temp. sensor FP cal. source
(if mode=3) |
| SWERHK11 |
1 |
I*2 |
Fabry-Pérot main current |
| SWERHK12 |
1 |
I*2 |
Fabry-Pérot correction current 1 |
| SWERHK13 |
1 |
I*2 |
Fabry-Pérot correction current 2 |
| SWERSLHK |
1 |
I*2 |
Slowly commutated Housekeeping (HK) |
| SWERIRC |
1 |
I*2 |
Internal readout counter |
| SWEREXEC |
1 |
I*2 |
``Execute'' flags |
Notes:
- 1.
- Twenty-four records are generated each second.
- 2.
- The five SWERDR fields contain the detector readouts,
whereas the thirteen SWERHK fields allow the wavelength falling
on each detector to be calculated.
- 3.
- The two GPSCRPID fields should always contain `1's for SWS, unless a
SSO is being tracked.
- 4.
- The selection of which of fields SWERHK1 to SWERHK10 contain valid
information is mode-dependent. The ``mode'' can be 0 (default), 1, 2 or 3. A
change in mode implies the start of a new measurement period, and the value of
the mode is contained in the corresponding Compact Status field
SSTAHKMD.
- 5.
- Whereas all other fields repeat at the rate of 24 Hz,
SWERSLHK repeats at 0.5 Hz. The meaning of any individual
readout depends on the accompanying value of SWERIRC.
- 6.
- SWERIRC begins at 1 (for the first readout cycle of a
new format), then increments up to 48. It is derived from the ``SWS internal
frame counter'' and indicates the sequence of information in
SWERSLHK.
- 7.
- SWEREXEC is extracted from the more significant byte
of the SWS internal frame counter. Because the flags are telemetered at a rate
of 12 Hz, they appear only in ERD records for which SWERIRC is a multiple of 2;
the flags are set to zero for the intervening records. The more significant
byte of SWEREXEC is always set to zero, i.e. the sign bit for the flags is not
extended.
9.2.2 SWS Compact Status
These files are normally named SSTA*.FITS.
The CSH files primary header, filled with example information, is described
in Table 9.2.2.
Most keywords are self explanatory, or have been described above.
Table 9.3:
CSH primary headers
| Header keyword |
Contents |
Comment |
| SIMPLE = |
T |
/ |
| BITPIX = |
8 |
/ |
| NAXIS = |
0 |
/ |
| EXTEND = |
T |
/ |
| ORIGIN = |
'ESA ' |
/ European Space Agency |
| TELESCOP= |
'ISO ' |
/ Infrared Space Observatory |
| INSTRUME= |
'SWS ' |
/ Instrument used |
| COMMENT |
|
/ SWS Compact Status |
| FILENAME= |
'SSTA26400248' |
/ File name in ISO archive |
| DATE = |
'09/07/95' |
/ Creation date 95/190 |
| FILEVERS= |
'0298 ' |
/ Version ID in ISO archive |
| OLPVERS = |
'OLP_21 ' |
/ SOC OLP system version |
| CALGVERS= |
'CALG_40 ' |
/ SOC OLP CAL-G files version |
| USERNAME= |
'PIPELINE' |
/ |
| VERS1 = |
'0298/SCSH264' |
/ Version ID of each input file |
| VERS2 = |
'1411/EOHA282' |
/ Version ID of each input file |
| VERS3 = |
'1411/EOHI282' |
/ Version ID of each input file |
| EQUINOX = |
2000.0 |
/ Equinox |
| TMRATE = |
32 |
/ Telemetry rate in Kbps (Kbits/sec) |
| EOHAUTCS= |
'96166223020' |
/ Approx. UTC of start of observation |
| EOHAUTCE= |
'96166223818' |
/ Approx. UTC of end of observation |
| EOHAAOTN= |
'S07 ' |
/ AOT name |
| EOHAPLID= |
'MPEWARM1' |
/ Proposal ID |
| EOHAOSN = |
'48 ' |
/ Observation sequence number |
| EOHAPSN = |
'0 ' |
/ Pointing sequence number |
| EOHAPCAT= |
'1 ' |
/ Proposal category |
| EOHACIND= |
' ' |
/ Calibration indicator |
| EOHATTYP= |
'2 ' |
/ Target type |
| AOTVERS = |
'94350161513' |
/ AOT-to-OCT logic version |
| TREFCOR1= |
241288656 |
/UTC of 1st reference time |
| TREFPHA1= |
282.19191 |
/Orbital phase at TREFCOR1 |
| TREFCOR2 = |
241289612 |
/UTC of 2nd reference time |
| TREFPHA2 = |
282.20301 |
/Orbital phase at TREFCOR2 |
| TREFCOR3 = |
241290568 |
/UTC of 3rd reference time |
| TREFPHA3 = |
282.21411 |
/Orbital phase at TREFCOR3 |
| ATTUTCSL= |
'96166222532' |
/ UTC of start time of slew to intended target |
| ATTUTCS = |
'96166222627' |
/ UTC of time of first arrival at intended target |
| ATTOTFTH= |
10.0 |
/ On-target flag threshold (arc secs) |
| ATTRA = |
302.66 |
/ Intended Right Ascension of instrument
viewing, in degrees |
| ATTDEC = |
27.8 |
/ Intended DEClination (with
ATTRA), in degrees |
| ATTTYPE = |
'P ' |
/ Type of attitude operation (P/R/T) |
| ATTGUIDE= |
150002 |
/ Guide star reference number |
| ATTSAANG= |
115.9 |
/ Solar aspect angle (degrees) |
| ATTERROR= |
0 |
/ CONTINGEncy flag(0=success; 1=target not acq'd) |
| TREFUTC1= |
241288656 |
/ UTC (whole seconds since 01-01-1989) |
| TREFUTC2= |
1428250 |
/ UTC (remaining fraction of second) |
| TREFUTK = |
617295744 |
/ ISO Uniform Time Key (UTK) |
| TREFITK = |
617295744 |
/ ISO INSTRUMENT Time Key (ITK) |
| TREFITKU= |
0.04166666666667 |
/ ITK unit length in seconds |
The Compact Status file contains records with the fields described in Table
9.4. The records are defined in the binary header of the FITS file.
Table 9.4:
CSH file
| Field name |
Number |
Format |
Comment |
| CSGPUKST |
1 |
I*4 |
UTK start time |
| CSGPUKEN |
1 |
I*4 |
UTK end time |
| CSGPIKST |
1 |
I*4 |
ITK start time |
| CSGPIKEN |
1 |
I*4 |
ITK end time |
| CSGPUTST |
2 |
I*4 |
UTC start time |
| CSGPUTEN |
2 |
I*4 |
UTC end time |
| CSGPOSN |
1 |
I*1 |
Observation Sequence Number |
| CSGPFILL |
15 |
I*1 |
Spare |
| SSTASHUT |
1 |
I*2 |
Shutter position (0=closed, or 1/2/3) |
| SSTAGAIN |
6 |
I*2 |
Nominal gain in each of
the bands (1/4/16) |
| SSTACALS |
4 |
I*2 |
Calibration source status |
| SSTARESP |
2 |
I*2 |
Reset interval in
frames (SW/LW) |
| SSTAHKMD |
1 |
I*2 |
House keeping mode |
| SSTAFPS |
1 |
I*2 |
FP selection (1=FP1, 2=FP2) |
| SSTASPAR |
9 |
I*2 |
Spare |
The four elements of SSTACALS are:
- 1.
- Grating calibrator
- 2.
- Flusher
- 3.
- FP calibrator
- 4.
- Diffuse calibrator
A zero in a SSTACALS field indicates that the respective calibrator is off. 1
indicates it is on low, 2 that it is on high.
Next: 9.3 Standard processed (SPD)
Up: 9. Product Description
Previous: 9.1 Introduction
SWS Instrument & Data Manual, Issue 1.0, SAI/98-095/Dc